<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>p2</title>

    <style>
        div{
            width: 100px;
            height: 100px;
            background-color: blue;
            animation: move 5s;
        }
        @keyframes move {
            0%{
                background-color: #00f;
            }
            100%{
                background-color: #0f0;
                border-radius: 50%;
            }

        }

    </style>

</head>
<body>

<div></div>

</body>
</html>